基于APDL的轧机辊系变形仿真研究

辊系的弹性变形会直接影响到板形,它是板形研究的核心问题。开发了一种轧机参数化有限元仿真软件,利用VB软件进行可视化编程,提供一个友好的人机交互界面,VB后台调用ANSYS软件进行辊系变形的有限元仿真。软件通用性强,操作简单灵活,并根据工程需要提出了若干软件升级的技术方案。     

Formation of an Face-Centered Cubic Ta-Rich Solid Solution by Ion Beam Mixing in the Immiscible Ag-Ta System

Ta-rich and a Ag-rich solid solutions, both of face-centered cubic (fcc) structures, are observed in the Ag₁₄Ta₈₆ multilayered films on 200-keV xenon ion beam mixing, and the formation of two co-existing solid solutions is the result of a process of spinodal decomposition. The abnormal fcc Ta-rich solid solution has a Ta concentration larger than 86 at. pct and a lattice constant determined to be around 4.28 Å. Besides, first-principles calculations were employed to understand the possibility of a structural phase transition from body-centered cubic to fcc in Ta. Comparing the heat of formation (ΔH _f ) differences between fcc and bcc structures, Ta has the smallest ΔH _f difference among the four refractory metals (Ta, Mo, Nb, and W). It is concluded that the interfacial and irradiation energies play important roles in overcoming the energy barrier for the structural phase transition to take place.     

热压/热变形Nd2Fe14B/α-Fe纳米双相永磁体的研究

为了制备各向异性块状Nd2Fe14B／α—Fe纳米双相永磁体，研究了热压／热变形工艺参数与样品微观组织结构、磁性能之间的关系。结果表明，饱和磁化强度Js随模压温度的升高而提高；而剩磁Jr、内禀矫顽力Hcj和最大磁能积(BH)max开始都随模压温度的升高而上升，但超过一定温度后反而降低；同时提高热压压力会使磁性能增加，而热变形温度对磁性能影响很小。热变形后样品垂直于压力方向的磁性能略高于平行于压力方向，呈现出轻微的各向异性。Nd2Fe14B／α—Fe纳米双相永磁材料在热压／热变形后没有产生晶粒的择优长大，在晶体学上仍然是各向同性的。     

钢包炉(LF)预熔精炼渣的研究

预熔精炼渣具有成分均匀，性能稳定，储存时不吸水等特点，钢包炉中使用预熔精炼渣时成渣均匀且速度快，具有较强的吸附钢中非金属夹杂的能力。综合脱硫率高等冶金效果。有显著净化钢液作用。     

覆膜滤料的滤尘性能测试方法研究

由于覆膜滤料的结构和性能有别于普通滤料，因而普通滤料的滤尘性能测试方法不完全适用于覆滤料。本文作者在总结实践经验的基础上，提出了在覆膜滤料的滤尘性能测试中应注意的一些问题和应增加的测试项目。     

小方坯连铸中包长寿及定径水口快速更换技术

小方坯连铸中间包定径水口快速更换技术是提高连浇炉数的有效手段,与之配套的中间包长寿技术是实现高连浇炉数的保证。介绍了该项技术在首都钢铁集团第三炼钢厂的研制推广和应用情况,并阐述了快速更换机构的改进和中间包耐材的优化。     

磷钨酸掺杂聚苯胺催化剂催化合成丁酮乙二醇缩酮

报道了磷钨酸掺杂聚苯胺催化剂H3PW12O40／PAn的制备，通过丁酮和乙二醇反应合成了丁酮乙二醇缩酮，探讨了磷钨酸掺杂聚苯胺催化剂对缩酮反应的催化活性，较系统地研究了原料量比、催化剂用量、反应时间诸因素对产品收率的影响。实验表明：磷钨酸掺杂聚苯胺催化剂是合成丁酮乙二醇缩酮的良好催化剂，在n(乙二醇)：n(丁酮)=2：1，催化剂用量为反应物料总质量的0．5％，环己烷为带水剂，反应时间2．5h的优化条件下，丁酮乙二醇缩酮的收率可达67．2％。     

稀土在热喷涂(焊)中的运用

概述了稀土在热喷涂中的作用,着重介绍了稀土对喷涂层的硬度、结合强度、耐磨性、耐腐蚀性、抗氧化性等性能的影响。     

Quality Control Parameters for Robotic Bridge Painting

To protect a steel bridge from corrosion, periodic painting is needed. Bridge painting operations are dangerous and hazardous to human health. A robotic bridge painting system is being developed to replace the human being. One major problem with robotic bridge painting is how to achieve the specified coating quality, which includes two aspects: (1) the coating thickness; and (2) the coating appearance. To ensure quality of the robotic bridge painting, the writers have investigated: (1) the parameters that affect the coating thickness and appearance; (2) the values of the parameters to achieve the required thickness and appearance for the robotic painting; and (3) the thickness distribution functions of the bridge painting under various conditions. The specified painting quality can be achieved by using the results of this study to set up and control the robotic bridge painting system.